Benefit Plans (Schedule Of Components Of Net Periodic Pension Cost) (Details) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 21	$ 20
Interest cost	78	86
Expected return on plan assets	(123)	(111)
Net loss	69	56
Prior service cost	3	3
Net periodic pension cost	$ 48	$ 54